Refereed Journals

2018

• "Measurements of the Activation Energies for Atomic Hydrogen Diffusion on Pure Solid C0"
  Y. Kimura, M. Tsuge, V. Pirronello, A. Kouchi, N. Watanabe
  Astrophys. J. Lett. 858, L23 (2018)
  
  
• "The Ortho-to-para Ratio of Water Molecules Desorbed from Ice Made from Para-water Monomers at 11K"
  T. Hama, A. Kouchi, N. Watanabe
  Astrophys. J. Lett. 857, L13 (2018)
  
  
• "An infrared measurement of chemical desorption from interstellar ice analogues"
  Y. Oba, T. Tomaru, T. Lamberts, A. Kouchi, N. Watanabe,
  Nature Astronomy, 2, 228-232 (2018)
  
  

2017

• "Deuterium Fractionation upon the Formation of Hexamethylenetetramines through Photochemical Reactions of Interstellar Ice Analogs Containing Deuterated Methanol Isotopologues"
  Y. Oba, Y. Takano, H. Naraoka, A. Kouchi, N. Watanabe,
  Astrophys. J. Lett. 849, 122 (2017)
  
  
• "H₂ formation on interstellar dust grains: The viewpoints of theory, experiments, models and observations"
  V. Wakelam, E. Bron, S. Cazaux, F. Dulieu, C. Gry, P. Guillard, E. Habart, L. Hornekær, S. Morisset, G. Nyman, V. Pirronello, S. D. Price, V. Valdivia, G. Vidali, N. Watanabe
  Molecular Astrophysics 9, 1, (2017)
  
  
• "Laboratory Studies of Methane and Its Relationship to Prebiotic Chemistry"
  K. Kobayashi, W. D. Geppert, N. Carrasco, N. G. Holm, O. Mousis, M. E. Palumbo, J. H. Waite, N. Watanabe, L. M. Ziurys
  Astrobiology 17, 786, (2017)
  
  
• "Liquid-like behavior of UV-irradiated interstellar ice analog at low temperatures"
  S. Tachibana, A. Kouchi, T. Hama, Y. Oba, L. Piani, I. Sugawara, Y. Endo, H. Hidaka, Y. Kimura, K. Murata, H. Yurimoto, N. Watanabe,
  Science Advances 3, eaao2538 (2017)
  
  
• "Fast crystalline ice formation at extremely low temperature through water/neon matrix sublimation"
  T. Hama, S. Ishizuka, T. Yamazaki, Y. Kimura, A. Kouchi, N. Watanabe, T. Sugimoto, V. Pirronello,
  Phys. Chem. Chem. Phys. 19, 17677 (2017)
  
  
• "Comprehensive Study of Thermal Desorption of Grain surface Species by Accretion Shocks around Protostars"
  Hitoshi Miura, Tetsuo Yamamoto, Hideko Nomura, Taishi Nakamoto, Kyoko K. Tanaka, Hidekazu Tanaka, Makiko Nagasawa
  Astrophys. J. 839, 47(16pp) (2017)
  
  
• "Hydrogenation and Deuteration of C₂H₂ and C₂H₄ on Cold Grains: A Clue to the Formation Mechanism of C₂H₆ with Astronomical Interest"
  Hitomi Kobayashi, Hiroshi Hidaka, Thanja Lamberts, Tetsuya Hama, Hideyo Kawakita, Johannes Kæstner, Naoki Watanabe
  Astrophys. J. 837, 155 (2017)
  
  
• "Two types of amorphous protein particles facilitate crystal nucleation"
  Tomoya Yamazaki, Yuki Kimura, Peter G. Vekilov, Erika Furukawa, Manabu Shiraie, Hiroaki Matsumoto, Alexander E. S. Van Driessche, Katsuo Tsukamoto
  PNAS 114, 2154-2159 (2017)
  
  
• "Simulations and Spectra of Water in CO Matrices"
  R. Escribano, E. Artacho, A. Kouchi, T. Hama, Y. Kimura, H. Hidaka, and N Watanabe
  Physical Chemistry Chemical Physics 19, 7280-7287 (2017)
  
  
• "Evolution of morphological and physical properties of laboratory interstellar organic residues with ultraviolet irradiation"
  L. Piani, S. Tachibana, T. Hama, H. Tanaka, Y. Endo, I. Sugawara, L. Dessimoulie, Y. Kimura, A. Miyake, J. Matsuno, A. Tsuchiyama, K. Fujita, S. Nakatsubo, H. Fukushi, S. Mori, T. Chigai, H. Yurimoto and A. Kouchi
  The Astrophysical Journal 837, 35 (2017)
  
  
• "Reactive Uptake of Gaseous Sesquiterpenes on Aqueous Surfaces"
  K. Matsuoka, Y. Sakamoto, T. Hama, Y. Kajii, S. Enami
  J. Phys. Chem. A 121, 810-818 (2017)
  
  

2016

• Selected as the Editors Choice "Matrix sublimation method for the formation of high-density amorphous ice"
  A. Kouchi, T. Hama, Y. Kimura, H. Hidaka, R. Escribano, N. Watanabe
  Chemical Physics Letters 658, 287-292 (2016)
  
  
• "Deuterium Fractionation during Amino Acid Formation by Photolysis of Interstellar Ice Analogs Containing Deuterated Methanol"
  Y. Oba, Y. Takano, N. Watanabe, A. Kouchi
  Astrophys. J. Lett. 827, L18 (2016)
  
  
• Selected as the Editors Choice "Negative catalytic effect of water on the reactivity of hydrogen abstraction from the C.H bond of dimethyl ether by deuterium atoms through tunneling at low temperatures"
  Y. Oba, N. Watanabe, A. Kouchi
  Chem. Phys. Lett. 662, 14 (2016)
  
  
• "Hydrogen.deuterium substitution in solid ethanol by surface reactions at low temperatures"
  Y. Oba, K. Osaka, T. Chigai, A. Kouchi, N. Watanabe
  Mon. Not. Roy. Astron. Soc. 462, 689 (2016)
  
  
• Selected as the Editors' Suggestion in PRL "Surface Temperature Dependence of Hydrogen Ortho-Para Conversion on Amorphous Solid Water"
  H. Ueta, N. Watanabe, T. Hama, A. Kouchi
  Physical Review Letters 116, 253201 (2016)
  
  
• "Stepwise formation of H₃O⁺(H₂O)_n in an ion drift tube: Empirical effective temperature of association/dissociation reaction equilibrium in an electric field"
  Y, Nakai, H. Hidaka, N. Watanabe, T. M. Kojima
  J. Chem. Phys. 144, 224306 (2016)
  
  
• "Statistical ortho-to-para ratio ofwater desorbed from ice at 10 kelvin"
  T. Hama, A. Kouchi, and N. Watanabe
  Science 351, 65 (2016)
  

2015

• "Signaturte of Quantum-Tunneling Diffusion of Hydrogen Atoms on Water Ice at 10 K"
  K. Kuwahata, T. Hama, A. Kouchi, and N. Watanabe
  Phys. Rev. Lett. 115, 133201 (2015)
  
  
• Editors Choice!　"Chiral glycine formation on cold interstellar grains by quantumtunneling hydrogen.deuterium substitution reactions"
  Y. Oba, N. Watanabe, Y. Osamura, and A. Kouchi
  Chem. Phys. Lett. 634, 53-59 (2015)
  
  
• "Quantum Tunneling Observed without its Characteristic Large Kinetic Isotope Effects"
  T. Hama, H. Ueta, A. Kouchi, and N. Watanabe
  PNAS 112, 7438-7443 (2015)
  
  

2014

• "Quantum Tunneling Hydrogenation of Solid Benzene and Its Control via Surface Structure"
  T. Hama, H. Ueta, A. Kouchi, N. Watanabe, and H. Tachikawa
  The Journal of Physical Chemistry Letters 5, 3843-3848 (2014)
  
  
• "Reaction kinetics and isotope effect of water formation by the surface reaction of solid H₂O₂ with H atoms at low temperatures"
  Yasuhiro Oba, Kazuya Osaka, Naoki Watanabe, Takeshi Chigai and Akira Kouchi
  Faraday Discussion 168, 185-204 (2014)
  

2013

• "Hydrogen isotopic substitution of solid methylamine through atomic surface reactions at low temperatures: A potential contribution to the D/H ratio of methylamine in molecular clouds",
  Yasuhiro OBA,Takeshi CHIGAI, Yoshihiro OSAMURA, Naoki WATANABE, Akira KOUCH
  Meteoritics & Planetary Science 1-16 (2013):DOI: 10.1111/maps.12096
  
  
• "Surface Processes on Interstellar Amorphous Solid Water: Adsorption, Diffusion, Tunneling Reactions, and Nuclear-Spin Conversion"
  Tetsuya Hama, Naoki Watanabe
  Chem. Rev. 113, 8783 (2013)
  

2012

• ”The Mechanism of Surface Diffusion of H and D Atoms on Amorphous Solid Water: Existence of Various Potential Sites”,
  T. Hama, K. Kuwahata, N. Watanabe, A. Kouchi, Y. Kimura. T. Chigai, V. Pirronello
  Astrophys. J. 757, 185 (2012)
  
  
• “Water Formation Through a Quantum Tunneling Surface Reaction, OH + H₂, at 10 K", Y. Oba, N. Watanabe, T. Hama, K. Kuwahata, H. Hidaka, A. Kouchi,
  Astrophys. J. 749:67 (2012)
  
  

2011

• “Spin temperature of water molecules desorbed from the surfaces of amorphous solid water, vapor-deposited and produced from photolysis of a CH₄/O₂ solid mixture"
  T. Hama, N. Watanabe, A. Kouchi, and M. Yokoyama.
  Astrophys. J. Lett. 738, L15 (2011)
  


• “FTIR study of ammonia formation via the successive hydrogenation of N atoms trapped in a solid N₂ matrix at low temperatures"
  H. Hidaka, M. Watanabe, A. Kouchi and N. Watanabe.
  Phys. Chem. Chem.l Phys. 13,15798 (2011)
  


• “Experimental studies of surface reactions among OH radicals that yield H₂O and CO₂ at 40-60 K"
  Y. Oba, N. Watanabe, A. Kouchi, T. Hama, and V. Pirronello.
  Phys. Chem. Chem. Phys. 13, 15792 (2011)
  


• “A theoretical and experimental study on translational and internal energies of H₂O and OH from the 157 nm irradiation of amorphous solid water at 90 K"
  S. Andersson, C. Arasa, A. Yabushita, M. Yokoyama, T. Hama, M. Kawasaki, C. M. Western and M. N. R. Ashfold.
  Phys. Chem. Chem. Phys. 13, 15810 (2011)
  


• “Surface abundance change in vacuum ultraviolet photodissociation of CO₂ and H₂O mixture ices"
  T. Kinugawa, A. Yabushita, M. Kawasaki, T. Hama, and N. Watanabe.
  Phys. Chem. Chem. Phys. 13, 15785 (2011)
  


• “Laboratory studies on the formation of formic Acid (HCOOH) in interstellar and cometary ices"
  C. J. Bennett, T. Hama, Y. S. Kim, M. Kawasaki, and R. I. Kaiser,
  Astrophys. J. 727, 27 (2011)
  


• “Translational and rotational energy measurements of desorbed water molecules in their vibrational ground state following 157 nm irradiation of amorphous solid water”
  T. Hama, M. Yokoyama, A. Yabushita, M. Kawasaki, & N. Watanabe,
  Nucl. Instr. Methods B 269, 1011-1015 (2011)
  
  

2010

• “Formation of Carbonic Acid (H₂CO₃) by Surface Reactions of Non-energetic OH Radicals with CO Molecules at Low Temperatures”
  Y. Oba, N. Watanabe, A. Kouchi, T. Hama, & V. Pirronello,
  Astrophys. J. 722, 1598-1606. (2010)
  
  
• “Role of OH radicals in the formation of oxygen molecules following vacuum ultraviolet photodissociation of amorphous solid water”
  T. Hama, M. Yokoyama, A. Yabushita, & M. Kawasaki,
  J. Chem. Phys. 133, 104504 (2010)
  
  
• “Direct measurements of hydrogen atom diffusion and the spin temperature of nascent H₂ molecule on amorphous solid water”
  N. Watanabe, Y. Kimura, A. Kouchi, T. Chigai, T. Hama, & V. Pirronello,
  Astrophys. J. Lett. 714, L233 (2010)
  
  
• “A desorption mechanism of water following vacuum-ultraviolet irradiation on amorphous solid water at 90 K”
  T. Hama, M. Yokoyama, A. Yabushita, M. Kawasaki, S. Andersson, C.M. Western, M.N.R. Ashfold, R.N. Dixon, & N. Watanabe,
  J. Chem. Phys. 132, 164508 (2010)
  
  
• “Direct evidence for ammonium ion formation in ice through ultraviolet-induced acid-base reaction of NH₃ with H₃O⁺”
  E-S. Moon, H. Kang, Y. Oba, N. Watanabe, & A. Kouchi,
  Astrophys. J. 713, 906 (2010)
  
  
• “Experimental study of CO₂ formation by surface reactions of non-energetic OH radicals with CO molecules”
  Y. Oba, N. Watanabe, A. Kouchi, T. Hama, & V. Pirronello,
  Astrophys. J. Lett. 712, L174 (2010)
  
  

• “Formation of Carbonic Acid (H₂CO₃) by Surface Reactions of Non-energetic OH Radicals with CO Molecules at Low Temperatures”
  Y. Oba, N. Watanabe, A. Kouchi, T. Hama, & V. Pirronello,
  Astrophys. J. 722, 1598-1606 (2010)
  
  
• “Role of OH radicals in the formation of oxygen molecules following vacuum ultraviolet photodissociation of amorphous solid water"
  T. Hama, M. Yokoyama, A. Yabushita, & M. Kawasaki,
  J. Chem. Phys. 133, 104504 (2010)
  
  
• “Direct measurements of hydrogen atom diffusion and the spin temperature of nascent H₂ molecule on amorphous solid water"
  N. Watanabe, Y. Kimura, A. Kouchi, T. Chigai, T. Hama, & V. Pirronello,
  Astrophys. J. Lett. 714, L233 (2010)
  
  
• “A desorption mechanism of water following vacuum-ultraviolet irradiation on amorphous solid water at 90 K"
  T. Hama, M. Yokoyama, A. Yabushita, M. Kawasaki, S. Andersson, C.M. Western, M.N.R. Ashfold, R.N. Dixon, & N. Watanabe,
  J. Chem. Phys. 132, 164508 (2010).
  
  
• “Direct evidence for ammonium ion formation in ice through ultraviolet-induced acid-base reaction of NH₃ with H₃O⁺"
  E-S. Moon, H. Kang, Y. Oba, N. Watanabe, & A. Kouchi,
  Astrophys. J. 713, 906 (2010)
  
  
• “Experimental study of CO₂ formation by surface reactions of non-energetic OH radicals with CO molecules”
  Y. Oba, N. Watanabe, A. Kouchi, T. Hama, & V. Pirronello,
  Astrophys. J. Lett. 712, L174 (2010)
  
  
• “Reaction routes in the CO-H₂CO-d_n-CH₃OH-d_m system clarified from H (D) exposure of solid formaldehyde at low temperatures”
  H. Hidaka, M. Watanabe, A. Kouchi, & N. Watanabe,
  Astrophys. J. 702, 291 (2009)
  
  
• “Formation mechanisms of oxygen atoms in the O(³P_J) state from the 157 nm photoirradiation of amorphous water ice at 90 K”
  T. Hama, A. Yabushita, M. Yokoyama, M. Kawasaki, & N. Watanabe,
  J. Chem. Phys. 131, 114511 (2009)
  
  
• “Hydrogen isotope exchange and H(D) atom addition reaction of solid formaldehyde on amorphous solid water at low temperatures”
  H. Hidaka, M. Watanabe, A. Kouchi, & N. Watanabe,
  J. Phys. Conf. Ser. 194, 132024 (2009)
  
  
• “Nonenergetic reactions between atomic hydrogen and molecules on interstellar grain surfaces”
  N. Watanabe, A. Kouchi. H. Hidaka, Y. Oba, & N. Miyauchi,
  J. Phys. Conf. Ser. 194, 012044 (2009)
  
  
• “Formation mechanisms of oxygen atoms in the O(¹D₂) state from the 157 nm photoirradiation of amorphous water ice at 90 K”
  T. Hama, A. Yabushita, M. Yokoyama, M. Kawasaki, & N. Watanabe,
  J. Chem. Phys. 131, 114510 (2009)
  
  
• “Formation of compact amorphous H₂O ice by codeposition of hydrogen atoms with oxygen molecules on grain surfaces”
  Y. Oba, N. Miyauchi, H. Hidaka, T. Chigai, N. Watanabe, & A. Kouchi,
  Astrophys. J. 701, 464-470(2009)
  
  
• “Translational and rotational energy measurements of photodesorbed water molecules in their vibrational ground state from amorphous solid water”
  A. Yabushita, T. Hama, M. Yokoyama, M. Kawasaki, S. Andersson, R. N. Dixon, M. N. R. Ashfold, & N. Watanabe,
  Astrophys. J. Lett. 699, L80-L83 (2009)
  
  
• “Production of multiply charged ions from the 4d photoionization of Cs⁺”
  T. Koizumi, T. M. Kojima, M. Sano, & N. Watanabe,?
  J. Phys. Conf. Ser. 163, 012099 (2009)
• “Ice surface reactions: A key to chemical evolution in space”
  Naoki Watanabe & Akira Kouchi,
  Prog. Surf. Sci. 83, 439-489 (2008)
• “Release of hydrogen molecules from the photodissociation of amorphous solid water and polycrystalline ice at 157 and 193 nm”
  A. Yabushita, T. Hama, D. Iida, N. Kawanaka, M. Kawasaki, N. Watanabe, M. N. R. Ashfold, & H-P. Loock,
  J. Chem. Phys. 129, 044501 (2008)
• “Size distributions of chondrules and dispersed droplets caused by liquid breakup: An application to shock wave conditions in the solar nebula”
  T. Kadono, M. Arakawa, & A. Kouchi,
  Icarus, 197, 621 (2008)
• “Measurements of energy partitioning in H2 formation by photolysis of amorphous water ice”
  A. Yabushita, T. Hama, D. Iida, N. Kawanaka, M. Kawasaki, N. Watanabe, M. N. R. Ashfold, & H-P. Loock,
  Astrophys. J. Lett., 682, L69 (2008)
• “Formation of hydrogen peroxide and water from the reaction of cold hydrogen atoms with solid oxygen at 10 K”
  N. Miyauchi, H. Hidaka, T. Chigai, A. Nagaoka, N. Watanabe & A. Kouchi,
  Chem. Phys. Lett. 456, 27-30 (2008)
• “Structural effects of ice grain surfaces on the hydrogenation of CO at low temperatures”
  H. Hidaka, N. Miyauchi, A. Kouchi & N. Watanabe,
  Chem. Phys. Lett. 456, 36-40 (2008)
• “Laboratory Simulation of competition between hydrogenation and photolysis in the chemical evolution of H₂O-CO ice mixtures”
  N. Watanabe, O. Mouri, A. Nagaoka, T. Chigai, A. Kouchi & V. Pirronello,
  Astrophys. J. 668, 1001 (2007)
• “Temperature, composition, and hydrogen isotope effect in the hydrogenation of CO at 10 - 20 K”
  H. Hidaka, A. Kouchi & N. Watanabe,
  J. Chem. Phys. 126, 204707 (2007)
• “Effective rate constants for the surface reaction between solid methanol and deuterium atoms at 10 K”
  A. Nagaoka, N. Watanabe, & Akira Kouchi,
  J. Phys. Chem. A 111, 3016 (2007)
• “Dependence of the effective rate constants for the hydrogenation of CO on the temperature and composition of the surface”
  N. Watanabe, A. Nagaoka, H. Hidaka, T. Shiraki, T. Chigai, & A. Kouchi,
  Planet. Space Sci., (2006) 54, 1107 (2006)

Proceedings